Real time recording VS non real time recording
What is real time recording?
Real time recording is when the recording is done on 30 FPS (Frames per second) on each channel. If the DVR has four channels it has to have 120 FPS to record in real time, 16 channel DVR should have 480 FPS to record in real time. In another words 30fps on each channel.
Don’t get confuse with 480 fps display with 480 fps recording. 480 fps display means it is only going to display in real time. Looking for real time recorder? Simple formula -number of channels times 30 fps.
When you record in real time you will need larger capacity hard drives, otherwise you going to get less day recording. Most DVR have an option to adjust the recording fps, you can adjust the fps to get more days of recording. Here is a simple comparison to help you understand even better, suppose you have V8 engine in your car you going to need more gas compared to a person who has only 4 cylinder engine car.
A word of advice, everyone do not need real time recording for most people recording at 10 fps will be good enough, same thing an expensive Corvette Car will take you from point A to point B, an affordable Toyota Camry will also take you from point A to point B but with less gas. So it all depends on your need and budget. Don’t get me wrong here, it is always better to buy more fps recording DVR, but if you going to set it up at 5 fps recording anyway, then it is pointless. Any who, it is your money and I not Oprah Winfrey to give you advice on this.
Another important thing real time recording does not mean you going to get a clear picture, you have to check how the DVR going to record? Is it CIF. Half D1 or full D1. Security equipment manufacturers play all kind of tricks to confuse people to sell their product. You should look for real time recorder with D1 recording on all channels, not just one or two. This is exceedingly common mistake people make some make sure read the specifications before you buy. If the specifications are not clear enough write or call the seller to verify. There are two noteworthy things, 30 fps on each channel for recording and d1 recording.
Another thing if you going to record in motion and you are not motoring a busy place with a lot of motion, you can get real time recording by setting the DVR to pass all frames to a camera which is recording. Note-all DVR’s might not have this option.
Sorry to be a party-pooper (A person who ruins a party by either stopping the fun or not participating in a certain activity.) All this was about Analog DVR’s. Things gone up a notch these days, there are HD-SDI DVR’s with HD-SDI Cameras and NVR’s with IP-camera. It is a high end stuff talking about MP( mega pixels) and 1080p (pixel) display.